I'm trying to add a second SSD and can't find the special motherboard JP1 power 4-pin to 15-pin SATA power cable (not molex; motherboard size.)

Does anyone know a source? Or have the one that came with their mini to sell to me?

As seen in lower-right here: CoreHT Series - ASRock Inc.
Or next to the remote here: VisionX Series - ASRock Inc.

Monoprice, Newegg, Amazon, can't find this cable...